At 1625 Mountain time, the aircraft was substantially damaged when it impacted an oil tank while landing. Visual conditions prevailed; the Airline Transport pilot and pilot-rated passenger sustained serious injuries. The pilot subsequently stated they were attempting to land on Runway 15 when the airplane impacted the oil tank on the left side of the runway. The right wing separated, and the right horizontal stabilizer was bent up and wrinkled. The closest official weather observation at the time of the accident included winds from 340 degrees at 21 knots, gusting to 27 knots. A peak wind recorded at 29 minutes past the hour was from 230 degrees at 29 knots.